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                Pku3164 Command Network                </h1>
                <p>时间限制：30s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; MST</span><span style="font-size: 12pt">（最小生成树）：对于无向带权图&lt;V，E&gt;，若其导出子图的边权和最小，且原图V中对应的任意两个顶点间有且仅有一条通路，则称此图为原图的MST。</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; </span><span style="font-size: 12pt">你的任务很简单，对于给定的有向带权图，求出其&ldquo;最小生成树&rdquo;，即指定一个根以后，每个点都是从根出发可达的。</span></div>
<div>&nbsp;</div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; </span><span style="font-size: 12pt">输入文件最多包含3组测试数据，对于每组测试数据：</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; </span><span style="font-size: 12pt">第一行为两个数n,m，表示有向带权图的顶点数和边数，点编号为1~n。</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; </span><span style="font-size: 12pt">接下来n行，每行两个整数X_i,Y_i，表示i个顶点在直角坐标系中的坐标。</span></div>
<div><span style="font-size: 12pt">&nbsp;&nbsp;&nbsp; </span><span style="font-size: 12pt">接下来m行，每行两个正整数x,y，表示存在一条由点x指向点y的有向边，边权为两顶点的曼哈顿距离（定义见下）。</span></div>
<div>&nbsp;</div></p><hr/><h3>输出格式</h3><p><div style="text-indent: 21pt"><span style="font-size: 12pt">对于每组测试数据，输出一行：</span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">如果不存在&ldquo;最小生成树&rdquo;，输出&ldquo;Poor&rdquo;；</span></div>
<div style="text-indent: 21pt"><span style="font-size: 12pt">否则输出最小边权和。</span></div>
<div>&nbsp;</div></p><hr/><h3>样例输入</h3><pre>    3 3
    0 0
    1 0
    2 0
    1 2
    1 3
    2 3
    3 2
    0 0
    1 0
    2 0
    1 2
    3 2
 
</pre><hr/><h3>样例输出</h3><pre>2
Poor
 
</pre><hr/><h3>提示</h3><p><p>&nbsp;&nbsp;&nbsp; 100%的数据，n&le;1000，m&le;n*n，0&le;X_i,Y_i&le;10000。<br />
&nbsp;&nbsp;&nbsp; 可能存在自环。<br />
&nbsp;<br />
【温馨提示】<br />
对于两个点(a,b)，(c,d)，它们的曼哈顿距离定义如下：<br />
l=|a-c|+|b-d|</p></p><hr/><h3>题目来源</h3><p> 鸣谢 Hewr</p>
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